Results 121 to 130 of about 1,182 (150)
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Vibrational Motion of Arctic Pack Ice,
1997Abstract : There are many physical mechanisms responsible for vibrations of sea, and they force motions in a very wide band of frequencies from less than 0.01 Hz to greater than 100 Hz. Detailed measurements of the vertical velocity in this frequency band were previously shown to be produced by gravity waves, ridging events and wind turbulence. In this
Zandy Williams +2 more
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Elastic waves in Arctic pack ice
Eos, Transactions American Geophysical Union, 1954Elastic wave propagation was studied in the Arctic ice pack, on the Beaufort Sea, the Arctic Ocean, and at near‐shore locations. Ice thicknesses varied from 0.1 to 2.1 meters and water depths from 1 ½ to 3800 meters. Values of the elastic constants were derived from the measured velocities of the longitudinal and shear waves and the density. Dispersive
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Pack-ice studies in the Arctic Ocean
Journal of Geophysical Research, 1959The annual stratification of pack ice has been examined. Summer layers are formed either by arrested growth or by thin layers of fresh-water ice. The crystal structure and the salt content of the ice reflect the seasonal cycle. During the growth of ice a pronounced orientation of crystalline structure develops; it is determined by vertical as well as ...
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Underwater Backscattering Strengths of Arctic Pack Ice
The Journal of the Acoustical Society of America, 1964The backscattering strengths under Arctic sea ice for octave bands between 12 cps and 4 kc/sec were measured, using explosive sound sources. The measurements were made from a camp established in April 1962 on broken and pressure-packed one-year ice over the Canada Deep.
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Low‐frequency vibrational motion of Arctic pack ice
Journal of Geophysical Research: Oceans, 1992The mechanisms responsible for vibrational motions of Arctic ice at frequencies below about 100 Hz are know to be a combination of wave types, namely, gravity waves, flexural waves, and a variety of acoustic and/or elastic waves. Surface motion measurements using geophones and accelerometers on multiyear pack ice are used to establish the energy level ...
J. P. Dugan, R. L. DiMarco, W. W. Martin
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The Effect of Tensile Strength in the Arctic Ice Pack
2001The ice pack covering northern seas is composed of an aggregate of thick ridged and rafted ice, undeformed ice, and open water. Existing ice-ocean models of the Arctic ice pack are large-scale continuum models that use a plastic yield surface to characterize the constitutive behavior of the pack. An alternative approach, which captures far more detail,
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Near-Field Ice Management Tactics for Floating Drilling in Arctic Pack Ice
Arctic Technology Conference, 2016Abstract In order to be economically viable, Arctic floating drilling in high concentration pack ice requires very high confidence that ice interaction does not lead to costly, unanticipated emergency disconnections of the rig from the well.
Jed Hamilton +6 more
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Winter Sightings of Marine Mammals in Arctic Pack Ice
ARCTIC, 1987There is limited information about the winter distribution of some arctic marine mammals. In February-March 1976 six species of marine mammals were sighted in the pack ice of Baffin Bay and Davis Strait. Hooded seals were sighted along the ice edge in February, but in late March adults with pups were seen.
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Observations of internal gravity waves under the Arctic pack ice
Journal of Geophysical Research: Oceans, 1987Internal gravity waves measured under the Arctic pack ice were strikingly different from measurements at lower latitudes. The total wave energy, integrated over the internal wave frequency band, was lower by a factor of 0.03–0.07, and the spectral slope at high frequency was nearly −1 in contrast to the − 2 observed at lower latitudes.
Murray D. Levine +2 more
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The effects of individual ridging events on the ice thickness distribution in the Arctic ice pack
Cold Regions Science and Technology, 1996Abstract The sea ice thickness distribution in the polar oceans evolves in response to both dynamic and thermodynamic forcing. The variable thickness of the ice cover is created by deformation, that simultaneously causes formation of thick ice through ridge building and thin ice through lead creation.
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